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To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
 benh@kernel.crashing.org, paulus@samba.org
From: Michael Ellerman <patch-notifications@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org,
 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: [1/3] powerpc/mm/radix: Update pte update sequence for pte clear
 case
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Date: Thu, 16 Feb 2017 16:59:47 +1100 (AEDT)
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On Thu, 2017-02-09 at 02:58:19 UTC, "Aneesh Kumar K.V" wrote:
> In the kernel we do follow the below sequence in different code paths.
> pte = ptep_get_clear(ptep)
> ....
> set_pte_at(ptep, pte)
> 
> We do that for mremap, autonuma protection update and softdirty clearing. This
> implies our optimization to skip a tlb flush when clearing a pte update is
> not valid, because for DD1 system that followup set_pte_at will be done witout
> doing the required tlbflush. Fix that by always doing the dd1 style pte update
> irrespective of new_pte value. In a later patch we will optimize the application
> exit case.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> Tested-by: Michael Neuling <mikey@neuling.org>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/ca94573b9c69d224e50e1084a27767

cheers